Hi Henry: I have an Inmarsat demodulator working for the lower speed control channels. I am writing a program to decode the traffic, but this is not a trivial task. Think on the order of 1000 lines of C. It is "almost" working, I am hoping for valid output in the next week or so, depending on my free time.
My program is currently a standalone program, but once it's done it could conceivably be converted to one or more gnuradio blocks. I suggest the following document to give you background on the channel specifications for Inmarsat: http://www.icao.int/safety/acp/inactive%20working%20groups%20library/acp-wg-m-iridium-8/ird-swg08-wp07%20-%20old_amss_material_ch.4_plus_attachment.doc The demodulation is fairly easy, read the spec document and the channel characteristics are pretty well described. My gnuradio demodulator is based on the GMSK demod block. I'm using a home brew patch antenna, and the LNA4ALL low noise amplifier. Kevin Sent from my iPad > On May 3, 2016, at 12:45 PM, Henry Barton <[email protected]> wrote: > > http://rtlsdrblog.rtlsdrblog.netdna-cdn.com/wp-content/uploads/2015/10/sdrplay_lband-1024x573.png > I didn’t see the widest signal (bright yellow) from this picture on > sigidwiki.com. Does anyone know what it is? If so, can it be decoded by > GNUradio? Thanks. > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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